Skip to content

⚡ Optimize WebSocket masking via integer conversion #5

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
maattyi wants to merge 1 commit into
base: main
Choose a base branch
from
Open

⚡ Optimize WebSocket masking via integer conversion #5

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
32 changes: 23 additions & 9 deletions src/ws.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@

import os
import struct
import sys


def ws_encode(data: bytes, opcode: int = 0x02) -> bytes:
Expand All @@ -26,11 +27,18 @@ def ws_encode(data: bytes, opcode: int = 0x02) -> bytes:
mask = os.urandom(4)
head += mask

masked = bytearray(data)
for i in range(len(masked)):
masked[i] ^= mask[i & 3]
if not data:
return bytes(head)

return bytes(head) + bytes(masked)
length = len(data)
repeats = (length + 3) // 4
full_mask = (mask * repeats)[:length]

data_int = int.from_bytes(data, sys.byteorder)
mask_int = int.from_bytes(full_mask, sys.byteorder)
masked = (data_int ^ mask_int).to_bytes(length, sys.byteorder)

return bytes(head) + masked


def ws_decode(buf: bytes):
Expand Down Expand Up @@ -68,9 +76,15 @@ def ws_decode(buf: bytes):
if len(buf) < pos + length:
return None

payload = bytearray(buf[pos : pos + length])
if mask:
for i in range(len(payload)):
payload[i] ^= mask[i & 3]
payload = buf[pos : pos + length]
if mask and payload:
repeats = (length + 3) // 4
full_mask = (mask * repeats)[:length]

payload_int = int.from_bytes(payload, sys.byteorder)
mask_int = int.from_bytes(full_mask, sys.byteorder)
payload = (payload_int ^ mask_int).to_bytes(length, sys.byteorder)
else:
payload = bytes(payload)

return opcode, bytes(payload), pos + length
return opcode, payload, pos + length